From: Hugo Villeneuve <hvilleneuve@xxxxxxxxxxxx>
The watchdog value register cannot be read on the PCF2131 after being
set.
Add a new flag to identify which variant has read access to this
register, and use this flag to selectively test if watchdog timer was
started by bootloader.
Signed-off-by: Hugo Villeneuve <hvilleneuve@xxxxxxxxxxxx>
---
drivers/rtc/rtc-pcf2127.c | 20 ++++++++++++++------
1 file changed, 14 insertions(+), 6 deletions(-)
diff --git a/drivers/rtc/rtc-pcf2127.c b/drivers/rtc/rtc-pcf2127.c
index 3fd2fee4978b..1d2b5c9e6757 100644
--- a/drivers/rtc/rtc-pcf2127.c
+++ b/drivers/rtc/rtc-pcf2127.c
@@ -214,6 +214,7 @@ struct pcf21xx_config {
int max_register;
unsigned int has_nvmem:1;
unsigned int has_bit_wd_ctl_cd0:1;
+ unsigned int wd_val_reg_readable:1; /* If watchdog value register can be read. */
unsigned int has_int_a_b:1; /* PCF2131 supports two interrupt outputs. */
unsigned int has_reset_reg:1; /* If variant has a reset register. */
u8 regs_td_base; /* Time/data base registers. */
@@ -511,7 +512,6 @@ static const struct watchdog_ops pcf2127_watchdog_ops = {
static int pcf2127_watchdog_init(struct device *dev, struct pcf2127 *pcf2127)
{
- u32 wdd_timeout;
int ret;
if (!IS_ENABLED(CONFIG_WATCHDOG) ||
@@ -539,12 +539,17 @@ static int pcf2127_watchdog_init(struct device *dev, struct pcf2127 *pcf2127)
watchdog_set_drvdata(&pcf2127->wdd, pcf2127);
/* Test if watchdog timer is started by bootloader */
- ret = regmap_read(pcf2127->regmap, pcf2127->cfg->reg_wd_val, &wdd_timeout);
- if (ret)
- return ret;
+ if (pcf2127->cfg->wd_val_reg_readable) {
+ u32 wdd_timeout;
+
+ ret = regmap_read(pcf2127->regmap, pcf2127->cfg->reg_wd_val,
+ &wdd_timeout);
+ if (ret)
+ return ret;
- if (wdd_timeout)
- set_bit(WDOG_HW_RUNNING, &pcf2127->wdd.status);
+ if (wdd_timeout)
+ set_bit(WDOG_HW_RUNNING, &pcf2127->wdd.status);
+ }
return devm_watchdog_register_device(dev, &pcf2127->wdd);
}
@@ -953,6 +958,7 @@ static struct pcf21xx_config pcf21xx_cfg[] = {
.max_register = 0x1d,
.has_nvmem = 1,
.has_bit_wd_ctl_cd0 = 1,
+ .wd_val_reg_readable = 1,
.has_int_a_b = 0,
.has_reset_reg = 0,
.regs_td_base = PCF2127_REG_TIME_DATE_BASE,
@@ -980,6 +986,7 @@ static struct pcf21xx_config pcf21xx_cfg[] = {
.max_register = 0x19,
.has_nvmem = 0,
.has_bit_wd_ctl_cd0 = 0,
+ .wd_val_reg_readable = 1,
.has_int_a_b = 0,
.has_reset_reg = 0,
.regs_td_base = PCF2127_REG_TIME_DATE_BASE,
@@ -1007,6 +1014,7 @@ static struct pcf21xx_config pcf21xx_cfg[] = {
.max_register = 0x36,
.has_nvmem = 0,
.has_bit_wd_ctl_cd0 = 0,
+ .wd_val_reg_readable = 0,
.has_int_a_b = 1,
.has_reset_reg = 1,
.regs_td_base = PCF2131_REG_TIME_DATE_BASE,
--
2.30.2
